/*
 * Copyright 2013-2019 Software Radio Systems Limited
 *
 * This file is part of srsLTE.
 *
 * srsLTE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * srsLTE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * A copy of the GNU Affero General Public License can be found in
 * the LICENSE file in the top-level directory of this distribution
 * and at http://www.gnu.org/licenses/.
 *
 */

#ifndef SRSLTE_OFDM_H
#define SRSLTE_OFDM_H

/**********************************************************************************************
 *  File:         ofdm.h
 *
 *  Description:  OFDM modulation object.
 *                Used in generation of downlink OFDM signals.
 *
 *  Reference:    3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6
 *********************************************************************************************/

#include <stdlib.h>
#include <strings.h>

#include "srslte/config.h"
#include "srslte/phy/common/phy_common.h"
#include "srslte/phy/dft/dft.h"

/* This is common for both directions */
typedef struct SRSLTE_API {
  srslte_dft_plan_t fft_plan;
  srslte_dft_plan_t fft_plan_sf[2];
  uint32_t          max_prb;
  uint32_t          nof_symbols;
  uint32_t          symbol_sz;
  uint32_t          nof_guards;
  uint32_t          nof_re;
  uint32_t          slot_sz;
  uint32_t          sf_sz;
  srslte_cp_t       cp;
  cf_t*             tmp; // for removing zero padding
  cf_t*             in_buffer;
  cf_t*             out_buffer;

  bool     mbsfn_subframe;
  uint32_t mbsfn_guard_len;
  uint32_t nof_symbols_mbsfn;
  uint8_t  non_mbsfn_region;

  bool  freq_shift;
  float freq_shift_f;
  cf_t* shift_buffer;
} srslte_ofdm_t;

SRSLTE_API int srslte_ofdm_init_(srslte_ofdm_t*   q,
                                 srslte_cp_t      cp,
                                 cf_t*            in_buffer,
                                 cf_t*            out_buffer,
                                 int              symbol_sz,
                                 int              nof_prb,
                                 srslte_dft_dir_t dir);

SRSLTE_API int srslte_ofdm_init_mbsfn_(srslte_ofdm_t*   q,
                                       srslte_cp_t      cp,
                                       cf_t*            in_buffer,
                                       cf_t*            out_buffer,
                                       int              symbol_sz,
                                       int              nof_prb,
                                       srslte_dft_dir_t dir,
                                       srslte_sf_t      sf_type);

SRSLTE_API int
srslte_ofdm_rx_init_mbsfn(srslte_ofdm_t* q, srslte_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t max_prb);

SRSLTE_API int
srslte_ofdm_rx_init(srslte_ofdm_t* q, srslte_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t max_prb);

SRSLTE_API int srslte_ofdm_tx_set_prb(srslte_ofdm_t* q, srslte_cp_t cp, uint32_t nof_prb);

SRSLTE_API int srslte_ofdm_rx_set_prb(srslte_ofdm_t* q, srslte_cp_t cp, uint32_t nof_prb);

SRSLTE_API void srslte_ofdm_rx_free(srslte_ofdm_t* q);

SRSLTE_API void srslte_ofdm_rx_slot(srslte_ofdm_t* q, int slot_in_sf);

SRSLTE_API void srslte_ofdm_rx_slot_ng(srslte_ofdm_t* q, cf_t* input, cf_t* output);

SRSLTE_API void srslte_ofdm_rx_sf(srslte_ofdm_t* q);

SRSLTE_API void srslte_ofdm_rx_sf_ng(srslte_ofdm_t* q, cf_t* input, cf_t* output);

SRSLTE_API int
srslte_ofdm_tx_init(srslte_ofdm_t* q, srslte_cp_t cp_type, cf_t* in_buffer, cf_t* out_buffer, uint32_t nof_prb);

SRSLTE_API int
srslte_ofdm_tx_init_mbsfn(srslte_ofdm_t* q, srslte_cp_t cp, cf_t* in_buffer, cf_t* out_buffer, uint32_t nof_prb);

SRSLTE_API void srslte_ofdm_tx_free(srslte_ofdm_t* q);

SRSLTE_API void srslte_ofdm_tx_slot(srslte_ofdm_t* q, int slot_in_sf);

SRSLTE_API void srslte_ofdm_tx_slot_mbsfn(srslte_ofdm_t* q, cf_t* input, cf_t* output);

SRSLTE_API void srslte_ofdm_tx_sf(srslte_ofdm_t* q);

SRSLTE_API int srslte_ofdm_set_freq_shift(srslte_ofdm_t* q, float freq_shift);

SRSLTE_API void srslte_ofdm_set_normalize(srslte_ofdm_t* q, bool normalize_enable);

SRSLTE_API void srslte_ofdm_set_non_mbsfn_region(srslte_ofdm_t* q, uint8_t non_mbsfn_region);

#endif // SRSLTE_OFDM_H
